Insulator



l. L. WIDIVIYER` INSULATOR.

APPLICATION man SEPT.29,1919.

Patented Dec. 14g 1920.

UNITED STATES PATENT OFFICE.v

JAMES L. WIDMYER, OF MINNEAPOLIS, MINNESOTA.

INSULATOR.

To all whom t may concern:

Be it known that I, JAMES L. WIDMYER, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Insulators, of which the following is a speciiication.

My invention relates to new and useful improvements in an insulator and more particularly to an insulator for connecting telephone, telegraph, or like wires to a pole or to the cross arms thereof. u

The primary object of the invention is the construction of the insulator in such a inanner that the wire may be securely connected thereto so that it cannot be accidentally disconnected.

Another object of the invention resides in the provision of a removable key or lock adapted for securing the wire to the iusulator and said key being removable for disconnecting the wire when desired.

A further object resides in the provision Yof means for connecting the insulator to the pole or to a pin secured to a cross arm of the pole.

With theseand other Objects in view my invention consists in the novel details of construction and arrangement of parts which will be more clearly understood from the following specification and drawings in which Figure l. is a side elevation.

F 2 is a front elevation.

Fig. 3 is a transverse vertical section on the line 3 3 of Fig. 2.

Fig. 4: is a longitudinal vertical section, with parts shown in elevation.

Fig. 5 is a fragmental longitudinal vertical section showing one of the dove-tailed grooves for holding the key in place in the insulator.

Fig. 6 is a top plan.

Fig. 7 is a bottom plan,

Fig. 8 is a side elevation of the locking key, and

Fig. 9 is a bottom plan of the locking key.

In the drawings I have illustrated my insulator as applied to and secured upon the end of a pin which is carried by the cross arm of a telephone or telegraph pole. This pin is of usual construction and it will be understood that it forms no part of the present invention. While I have illustrated the insulator as connected to a cross arm pin it will be understood that it might easily Specification of Letters Patent.

Application led September 29, 1919.

Patented Dec. l-iL, 1920.

serial No. 327,162.

as well be secured to the top of a pole or to a pin secured to the side of the pole or to a house or other like object.

ln the drawings the numeral 1i indicates the cross arm in and the body of the insulator which is preferably constructed of glass although it will be understood that it might equally as well be made of other insulating material. rlie body 2 is provided with a central opening, extending from the bottom thereof to a point adjacent the center. The pin l is adapted to be received in the opening as more particularly illustrated in Fig. l of the drawings.

A longitudinally exten-.ding groove 3 is formed in the front face of the body 2 and is adapted to receive a spring arm 4L which has the upper end bent at right angles as indicated at 5 to be embedded in the glass ad'acent the top end of the groove The lower end of the spring arm l is bent at right angles to forni a portion 6 and this right angled extension has a further extension which is bent back upon itself to form a portion 7 andan upwardly extending portion S. By bendingthe lower end of the spring arm, el, in this manner greater strength is given thereto for engaging the piu l. 'I he end of the right angled extensions G and i' are cut as indicated at 9, more particularly in Fig. 7 of the drawings, so as to conform to the curvature of the pin l. The extension is preferably cut so as to present a sharpened edge adapted to slightly embed itself into the pin thus preventing the accidental displacement of the insulator. As illustrated more particularly in Figs. 2 and 7 ofthe drawings the groove 3 is preferably of the dove-tailed type so that it will hold the spring arm in proper position to engage the pin.

The upper end of the body of the insulator is enlarged as indicated at 10 for forme ing a head. A laterally extending slot 11 is formed in the head and extends from the top thereof to a point where the head meshes with the body 2. A laterally extending groove 12 is formed in one face of the slot, intermediate the ends thereof, for receiving the telephone or telegraph wire 13 as more particularly illustrated in Figs. l and 3 of the drawings. The face of the Slot having the groove 12 is provided with a vertical dove-tailed slot 'la which extends from the top of the slot 1l. to the groove l2. A. dovetailed slot is formed in the opposite face of the slot 11 and extends from the top of the slot to a point adjacent the bottom thereof.

For securing the wire 13 in the groove 12 I provide a key indicated generally at 1G. The upper edge 17 of this key is curved so as to conform tothe curvature of the head 10. A handle 1S is formed on the top of the key and said handle is used for placing the key in the slot 11 or removing the same therefrom when desired. A dove-tailed tongue 19 is formed on one face of the key and a dove-tailed tongue 20 is formed on the opposite face thereof. The tongue 19 is of such a length as to correspond with the length of the dove-tailed slot 1-1 and the tongue 2() is of such a length as to conform with the dove-tailed slot 15. When the key is inserted in the slot 11 the tongue 19 will be received in the slot 14 and the tongue 2O in the slot 15. The face of the key, beneath the tongue 19, will engage the wire 13 and securely hold the same'within the groove 12. The lower end of the key is cut away so as to form the shoulders 21 and this reduces the width or length of the key so that the same will conform to the width of the body 2 of the insulator. The lower end of the tongues 19 and 2O are beveled as shown at 22 to form a point. This aids in the insertion of the tongues into the grooves.

From the above detailed description it is thought that the advantages of my insulator, as well as the use thereof, will be clearly understood. The insulator is to be secured to the cross pin 1 by means of the spring arm a, the extensions 6 and 7 of which extend beneath the bottom of the insulator and the curved end 9 engages the pin and, as above stated, preferably embeds itself slightly therein. The wire 13 is placed into the groove 12 and secured therein by means of the key 16. By providing the dove-tailed slots 11i and 15, and the dove-tailed tongues 19 and 20, the key is prevented from sliding from the sides of the insulator and can only be removed by pulling upwardly thereon. rihe handle 18 is used for placing the key in position or for removing the same.

The foregoing description and the drawings have reference to what may be considered the preferred, or approved, form of my invention. It is to be understood that I may make such changes in construction and arrangement and cen'ibinatimi of parts, inaterials, dimensions. etc., as may prove expedient and fall within the scope of the ap- .pended claims.

Having fully described my invention what l claim as new and desire to secure by Letters Patent is 1. An insulator having an opening in the bottom thereof, and a spring arm secured to the insulator, said spring arm provided with a right angled extension extending beneath the bottom of the insulator and slightly overlapping the opening.

2. An insulator having an opening in the bottom thereof, a vertically extending groove in the side, a spring` arm secured in the vertically extending groove, and a right angled extension formed on the bottom of the spring arm, said extension extending under the bottom of the insulator and normally overlying the openinvl in the bottom of the insulator.

In testimony whereof I aiiix my signature in presence of two witnesses.

. JAMES L. VVIDMYER.

Witnesses T. E. LATIMER, R. E. PEAsn. 

